So I sincerely need some help. Also this is my only vehicle and ofcourse I just started working a new job. Bad luck?

My truck won't start.............

My starter fuse blew 3 days ago. Got a new fuse, the fuse blew again when trying to crank. SO I replaced my starter & to my surprise after installing the new starter and replacing the 50a fuse, it blew. SO. My pal installed a push start ignition and I replaced my starter relay (basically getting rid of the smallest red wire going to my starter solenoid because for some reason their was a strong feeling the circuit to that wire was grounding out and that's a lot of work just to repair that wire to prevent a blown fuse, to then possibly find out that's not the only problem) after doing that, the fuse isn't blowing anymore but now when I go to crank my truck, it turns over but the engine will not start. Now I'm gonna go over everything up to now that IS NOT the problem. My battery is good it reads 12 volts. My starter is not the problem, it tries to start the engine. My fuel pump IS NOT the problem because I have fuel pressure and the fuel pump can be heard turning on when the ignition cylinder is rotated to start.
So this leaves me with 2 other possibilities.
Either my spark plugs are bad and not firing. Or my coil packs are bad.
IF anyone has ever had this problem before and narrowed things down to these last two factors. Please further elaborate as to which component was the problem before I go and buy the parts. If I replace the spark plugs and the coil packs. What else could it be?

Also I read on another post it could be the Crank Shaft position sensor??? Someone else also said they had the same issue, they reset their ECU and then it started up????

Hopefully I'm not being an idiot!